require(['map'],function(BMap){
		function load_script(xyUrl, callback){
		    var head = document.getElementsByTagName('head')[0];
		    var script = document.createElement('script');
		    script.type = 'text/javascript';
		    script.src = xyUrl;
		    //借鉴了jQuery的script跨域方法
		    script.onload = script.onreadystatechange = function(){
		        if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){
		            callback && callback();
		            // Handle memory leak in IE
		            script.onload = script.onreadystatechange = null;
		            if ( head && script.parentNode ) {
		                head.removeChild( script );
		            }
		        }
		    };
		    // Use insertBefore instead of appendChild  to circumvent an IE6 bug.
		    head.insertBefore( script, head.firstChild );
		}
		function translate(point,type,callback){
		    var callbackName = 'cbk_' + Math.round(Math.random() * 10000);    //随机函数名
		    var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from="+ type + "&to=4&x=" + point.lng + "&y=" + point.lat + "&callback=BMap.Convertor." + callbackName;
		    //动态创建script标签
		    load_script(xyUrl);
		    BMap.Convertor[callbackName] = function(xyResult){
		        delete BMap.Convertor[callbackName];    //调用完需要删除改函数
		        var point = new BMap.Point(xyResult.x, xyResult.y);
		        callback && callback(point);
		    }
		}

		window.BMap = window.BMap || {};
		BMap.Convertor = {};
		BMap.Convertor.translate = translate;
});

